numpy fft 备忘.

本文主要是介绍numpy fft 备忘.，对大家解决编程问题具有一定的参考价值，需要的程序猿们随着小编来一起学习吧！

主要参考以下注释网站

  1 #encoding:utf-8
  2 #https://blog.csdn.net/weixin_39949473/article/details/111337230
  3 #https://blog.csdn.net/weixin_35756373/article/details/112713361
  4 from numpy.fft import fft 
  5 
  6 import  pylab
  7 import matplotlib.pyplot as plt
  8 import numpy as np
  9 from matplotlib.animation import FuncAnimation
 10  
 11 ph=r"d:\Users\Administrator\Documents\Kangaroo_test\lin.txt"
 12 mtxt=''
 13 with open(ph,'r') as f:
 14     mtxt=f.read()
 15 txt=mtxt.split('\n')
 16 xn=[]
 17 for i in txt:
 18     if len(i)==0:
 19         continue
 20     sp,ep=i.split(r',')
 21     sp=float(sp)
 22     ep=float(ep)
 23     xn.append(sp+ep*1j)
 24     
 25 # xn=np.linspace(0.2, 3, 128)
 26 # X = fft([i+1/i*1j for i in xn])
 27 
 28 X = fft(xn)
 29 
 30 frames = len(X)  # number of animation frames
 31 n = frames       # number of ciecles
 32 coef = np.arange(frames)
 33 
 34 factor = []
 35 for i in range(len(coef)):
 36   factor.append(X[i] * np.exp(2 * np.pi * 1j * coef[i] * np.arange(frames) / frames) / frames)
 37 pos = [[0 for i in range(frames)]]
 38 for i in range(len(coef)):
 39   pos.append(pos[-1] + factor[i])
 40  
 41 fig, ax = pylab.subplots()
 42 lines = []
 43 circles = []
 44 def _init_lines():  
 45     global  lines  
 46     lines += [ax.plot([], [], alpha=1)[0] for i in range(n)]
 47  
 48 def _init_circles():
 49     global  circles,ax
 50     for i in range(n):
 51         radius = np.abs(pos[i+1][0] - pos[i][0])
 52         circle = plt.Circle((-1, -1), radius, alpha=0.6, fill=False)
 53         circles.append(circle)
 54         ax.add_artist(circle)
 55     ####
 56     circle_cyl=plt.Circle((-1, -1), 0.01, alpha=0.99, fill=True)
 57     circles.append(circle_cyl)
 58     ax.add_artist(circle_cyl)
 59     
 60     
 61 path_x = []
 62 path_y = []
 63  
 64 flag=0 
 65 def init_frame():
 66     global  flag
 67     flag+=1
 68     print ( flag )
 69     ax.clear()
 70     viewZoom=1
 71     ax.set(xlim=[-1*viewZoom, 1*viewZoom], ylim=[-1*viewZoom, 1*viewZoom])
 72     ax.axis('off')
 73     _init_lines()
 74     _init_circles()
 75     global path
 76     path = ax.plot([], [])[0]
 77  
 78 def _render_lines(k):
 79     for i in range(n):
 80         p, q = pos[i][k], pos[i+1][k]
 81         lines[i].set_data([p.real, q.real], [p.imag, q.imag])
 82     ###
 83     circles[-1].center = (q.real, q.imag)
 84  
 85 def _render_circles(k):
 86     for i in range(n):
 87         p = pos[i][k]        
 88         circles[i].center = (p.real, p.imag)
 89     
 90  
 91 def render_frame(k):    
 92     _render_lines(k)
 93     _render_circles(k)
 94     p = pos[n][k]
 95     path_x.append(p.real)
 96     path_y.append(p.imag)
 97     path.set_data(path_x, path_y)
 98     
 99 
100 fq= 1000/120
101 animation = FuncAnimation(fig,
102                           render_frame,
103                           frames=range(frames),
104                           interval=fq,
105                           repeat_delay=fq,
106                           init_func=init_frame,
107                           repeat=1)
108 pylab.show()
109 
110     

测试 txt点集文件

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